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Tom said to himself. "I'd better start with a skin-diving suit made of that molded plastic Arv is turning out." After having some of the Tomasite sheathing, with its embedding transducers, sent over from the plastics department, Tom cut out a suit from a pattern and welded the seams electronically. He had just finished wiring the control unit when Chow wheeled in a lunch cart.

Rick banked the Sky Wagon onto a new course, then settled down to locate the landmarks Barby and Jan had noted on the road map enclosed with their letter. The Sky Wagon had, until recently, been equipped with pontoons for water landing. Rick had outfitted it originally for a skin-diving trip to the Virgin Islands, an adventure now known as The Wailing Octopus.

"Guess I gunned my new skin-diving jet a bit too hard," Tom said sheepishly. "It was almost a K.O. for me!" Mr. Swift asked Tom about the invention. After explaining how it worked, Tom added with a grin, "Maybe you'd better hang around, Dad, until I install some sort of density-control gadget for my hydrolung. Then I can go up or down, or stay at any level easily."

Rick and Scotty took the two bulkiest to the cockpit and opened them to disclose full skin-diving equipment. The boys had made the cases themselves, to be carried like suitcases. Each held a single air tank, regulator, mask, fins, snorkel, underwater watch, depth gauge, weight belt, equipment belt, and knife.

Using microelectronic components, he was able to reduce all the units to amazingly small size. Next, Tom began tailoring himself a completely new skin-diving suit. Mask, ion-drive jet, and the various hydrolung units were molded into the plastic, with no loose wires or tubes showing. Monday morning he was ready to try the outfit.